Sure, but even if it's not the mc's, she could be pregnant. Actually it would make sense, if it didn't work out with her current boyfriend, so she moved back home where she have family and friends.
if she's pregnant, she's recently pregnant....
We already don't know her and if she shows up with an unplanned pregnancy we're not off to a good start...
I would take for granted that she is a girl who has not had sex and will not have sex with MC so no whining and no broken hearts.
the best solution would be Lynette in yet another chapter of her exciting diary (although I must say the last episode was less boring than the others).
to follow the few girls of the BR who have not had sex with MC, I hope it is not Heather otherwise it would mean goodbye glory dreams